Neuvillette is the Iudex of Fontaine, and the leader of the Marechaussee Phantom. While Neuvillette upholds the rules of the court with utmost reverence and frequently keeps Furina's flamboyancy in check, she is quite aloof when dealing with human emotions and often distances herself from the public eye. In accordance to her role as the Chief Justice, Neuvillette takes the court and trials very seriously, having no bias to her judgment. She is notably perceptive.